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DIAGNOSTIC DATA-BASED SAFETY AND AVAILABILITY ENHANCEMENTS FOR AN ALTERNATIVE OF FEEDFORWARD CONTROL USING FOUNDATION FIELDBUS
(2023-06-01)
Sittigon, Jirasak
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Suwanmanee, Ittimon
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Ukakimaparn, Prapart
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Julsereewong, Amphawan
;
Kummool, Sart
To enhance plant safety and production availability in case of transmitter failures for an alternative of Foundation Fieldbus (FF)-based feedforward control, this article proposes a practical technique for configuring control strategy using function block diagram concept. The proposed configuration technique is based on fault diagnostic data automatically accessed from FF transmitters to take actions for operating the studied FF-based control loop that utilizes a Bias/Gain (BG) function block to build feedforward summing function outside of a proportional-integral-derivative (PID) function block. The minor 'Uncertain' problem can be treated as severe 'Bad' problem to increase the safety of the control loop. On the other hand, the 'Uncertain' status can be configured to be treated as 'Good' status to improve the availability of the control loop. Six options for configuring function blocks to operate the temperature control performed at the DeltaV host system are described as a case study to demonstrate the workability of the proposed technique. Experimental results of the alternate feedforward control loop configured with different parameter options confirm that the diagnostic data provided by the transmitters used are very useful for implementing either the interested control loop with increased safety or the interested control loop with increased availability. Therefore, the user can strike a balance between safety and availability for the FF-based feedforward control utilizing BG function block.
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AVAILABILITY THROUGH FIELD DEVICE DIAGNOSIS IN FEEDFORWARD CONTROL: A CASE STUDY OF FOUNDATION FIELDBUS-BASED TEMPERATURE CONTROL
(2022-02-01)
Kummool, Sart
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Suwanmanee, Ittimon
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Weerathaweemas, Songchai
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Julsereewong, Amphawan
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Sittigorn, Jirasak
For endusers, requiring an action to enable a fieldbus-based process control that is not hazardous to continue its operation in the event of transmitter failures, it is essential to understand how diagnostic capability of field instruments is helpful in availability enhancement. In order to effectively implement a feedforward control strategy with increased availability, this article presents a control configuration method when utilizing a Foundation Fieldbus (FF)-based temperature feedforward control as an illustrative case study. Four function block assignment options for configuring the studied control strategy during engineering phase are described. The ‘Uncertain’ measurement status provided by temperature transmitters is treated as ‘Good’ measurement status in all control configuration options for availability goal by reducing process downtime. In addition, based on experimental results, a simplified Petri net model for logical behavior representation of the interested FF-based feedforward is also proposed.
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Process safety enhancement of feedforward control using foundation fieldbus
(2020-04-01)
Julsereewong, Amphawan
;
Kummool, Sart
This paper presents a practical technique in engineering phase for enhancing safety of Foundation Fieldbus (FF)-based feedforward control through propagation of measurement validity and status information in the loop using function block language to prevent hazards in the presence of a transmitter failure. The proposed technique is based on fault diagnosis of FF devices to increase the safety beyond that found in basic control loops using traditional technologies. For hybrid architecture by assigning basic and advanced function blocks to execute in H1 field instruments and H1 interface module, respectively, all possible cases for configuring parameter options not only to shut the loop down when the failure occurs but also to resume the loop to normal when the failure disappears are described. The feedforward on temperature control of H1 segment configured and operated on the DeltaV integrated host is used for experimentally testing the correctness of the defined parameter options to provide function block interlocks and failsafe actions as well as fault recovery mechanisms. In addition, the Petri net model to represent the control loop behaviors for comparing the process safety enhancement in different scenarios from five cases of parameter configurations is also included.
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Analysis of macrocycle schedules for an alternative of FF-based feedforward control
(2019-04-01)
Julsereewong, Amphawan
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Pannil, Pittaya
This paper focuses on analyzing the macrocycle schedules generated for an alternative implementation of Foundation Fieldbus (FF)-based feedforward control with hybrid architecture. The interested alternative control strategy is based on the use of the bias/gain (BG) function block to create feedforward summing function outside a proportional-integral-derivative (PID) function block for use to meet special operation requirements. An FF temperature control loop connected to the DeltaV distributed control system (DCS) providing built-in capability to execute function blocks in an H1 interface card is utilized as a case study to examine the effects of eight different configuration schemes on macrocycle schedules and function block synchronizations. Experimental results obtained from major configuration schemes by placing the PID block in the DCS host controller, the H1 interface card, and the temperature transmitter show that function block allocation affects the control performance to anticipate process disturbance effects.
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Comparative analysis between control in the host and control in the field in terms of safety and availability for foundation fieldbus-based process control
(2018-04-01)
Julsereewong, Amphawan
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Whatphat, Nopthawach
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Sangsuwan, Thaksin
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Chanwutitum, Jirasak
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Thepmanee, Teerawat
Design work of process control to provide necessary performance requirements must be based on capabilities and limitations of the technology used. This paper aims at analyzing possible safety and availability enhancements of basic process control based on Foundation Fieldbus (FF) technology in which the control function blocks can be assigned either in the host system controller, called ‘Control in the Host’ (CIH), or in the field devices, called ‘Control in the Field’ (CIF). Implementing the control loops with CIH and CIF strategies for water tank process is utilized as a case study to demonstrate the proposed analysis. The major configuration details of field devices, control strategies, and function blocks are described. Experimental results were analyzed for examining the parameter options as well as the control loop actions in response to invalid measurements to compare the safety and availability improvements between the CIH and the CIF. The proposed analysis can be useful to enable economical solutions for design phase of the FF-based control loops.
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Petri net modeling for performance analysis of FF-based process control in terms of safety and availability enhancement
(2017-12-13)
Sangsuwan, Thaksin
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Whatphat, Nopthawach
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Chanwutitum, Jirasak
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Thepmanee, Teerawat
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Julsereewong, Amphawan
In case of device and communication failures, a basic process control using Foundation Fieldbus technology can be configured to provide either safety improvement for preventing hazards or availability enhancement for minimizing production losses. The purpose of this paper is to introduce a system modeling with Petri Net technique for representing the behaviors of the proportional-integral-derivative (PID) and cascade loops with 'Control in the Field' (CIF) and 'Control in the Host' (CIH) architectures in response to instrument and communication failures. The proposed modeling is useful for performance analysis of the interested control loops in terms of safety and availability improvement. Stakeholders of both brownfield and greenfield projects in process industry sector can select a proper solution to their necessary performance requirements.
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Field-based temperature control using foundation™ fieldbus
(2015-01-01)
Petchmaneelumka, Wandee
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Pannil, Pittaya
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Julsereewong, Amphawan
In this article, a field-based temperature control using FOUNDATION™ Fieldbus (FF) is described. The proposed architecture is based on a powerful capability of FF H1 devices for building control in the field strategy. A plant model is designed and implemented for training purposes. H1 field instruments used are a 3144P temperature transmitter and an FI302 FF-to-current (FI) converter. Control block inside either the temperature transmitter or FI converter can be assigned for control decision. The NI-FBUS configurator and the developed LabVIEW-based human machine interface (HMI) are used for device configuration, control configuration, device commissioning, troubleshooting, and segment operation. Experimental results of temperature control in the range of 40-60°C verifying a workability of the proposed system are also included.
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Replacement of existing analog with digital fieldbus: A case study of raw cane sugar production
(2013-03-28)
Thepmanee, Teerawat
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Julsereewong, Amphawan
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Julsereewong, Prasit
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Jetanacheawchankij, Chaiwat
This article focuses on a digital fieldbus replacement for existing analog communications to bring automation infrastructure for operational excellence. Economic analysis between conventional and Foundation Fieldbus systems for new instrumentation and control installations in a raw cane sugar production is described as an illustrative case study. Surpassing the traditional analog system during project implementation, the digital fieldbus provides saving in material, installation, and commissioning costs. The studied case can be applied as a useful tool that can support planning and decision making for any small or large upcoming projects. © 2013 ICIC International.
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Foundation Fieldbus segment scheduling for fast loop controls
(2013-02-15)
Julsereewong, Amphawan
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Julsereewong, Prasit
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Harntujit, Piyaporn
In this article, a technique to obtain fast loop controls using Foundation Fieldbus-based control in the field strategy is presented. Macrocycle schedules for running a single control loop and running two control loops on a segment are examined. Performances of the proposed technique were studied through calculated macrocycle timing schedules produced by the DeltaV and CentumVP systems. Surpassing the traditional Distributed Control System (DCS) approach with control in the host, the proposed technique offers significant improvement in segment schedules with minimizing network scheduled communications. © 2013 ICIC International.
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Using fieldbus physical layer diagnostics in maintenance practice
(2013-02-15)
Kummool, Sart
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Julsereewong, Amphawan
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Julsereewong, Prasit
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Mekkrajai, Nukool
An availability of valuable physical layer diagnostic information in maintenance practice is presented in this article. Establishing an effective and efficient maintenance capability for Foundation Fieldbus segments installed at the Tail Gas Treating Unit, IRPC Public Company Limited, Thailand is described as an illustrative case study. Diagnostic-driven maintenance strategy not only reduces fixed and variable maintenance costs but also extends useful asset life by reducing the interval between maintenance events, reducing the cost of failures, and making it easier to plan maintenance and service work. © 2013 ICIC International.

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